/Engine/Source/Runtime/UMG/Public/Components/RichTextBlockDecorator.h
Override this function if you want to dynamically generate text, optionally changing the style. InOutString will start as the content between tags
virtual void CreateDecoratorText ( const [FTextRunInfo](API\Runtime\Slate\Framework\Text\FTextRunInfo) & RunInfo, [FTextBlockStyle](API\Runtime\SlateCore\Styling\FTextBlockStyle) & InOutTextStyle, [FString](API\Runtime\Core\Containers\FString) & InOutString ) const